文摘
To promote the application of polyacrylamide (PAM) in carbon dioxide flooding to enhance oil recovery, the solubility of PAM with different molecular weight (5 million, 7 million, 14 million, g·mol<sup>–1sup>) was measured using dynamic method in supercritical carbon dioxide (SCCO<sub>2sub>) at temperatures of 313, 323, and 333 K and pressures from 9.0 to 18.0 MPa. By comparing the differences of solubility data measured in SCCO<sub>2sub>, the effects of pressure, temperature and molecular weight on the solubility of PAM in SCCO<sub>2sub> were investigated. The solubility data of PAM in SCCO<sub>2sub> was correlated with five density-based semiempirical models (Chrastil, A-L, M-T, S-S, and Bartle) and A-L model obtained the best correlated results for PAM with different molecular weight. The self-consistency of PAM solubility was verified by M-T model. The enthalpy values of PAM, including ΔH<sub>tsub>, ΔH<sub>vapsub>, and ΔH<sub>solvsub>, were estimated through Chrastil and Bartle models.